Gustavus w



(Rommel.)

' G. W. BADER.

INVERT BLOCK POR SEWERS.

No. 249,397. Patented Nov. 8,1881.

mn ems' eS: Inventar.'

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UNITED STATES PATENT OFFICE.

GUSTAVUS W. BADER, OF NEW YORK, N. Y., ASSIGNOR TO HIMSELF AND MICHAEL SCHMITT, OF SAME PLAGE.

INVERT-BLOCK FOR SEWERS.

SPECIFICATION forming part of Letters Patent No. 49,397, dated Novenclloer 8, 1881. Application led September 17, 1881. (Nomodel.)

To all whom it may concern:

Be it known that I, GUsrAvUs W. BADER, of New York, in the county and State of New York, have invented a new and Improved In-l hollow invert-blocks forming the bottoms of sewers and the passage below for subdrainage. These invert-blocks, when made hollow for subdrainage, have heretofore usually been made with plain upright abutting ends, or with locking-plates placed over them, as shown in Letters Patent No. 236,8-10. Invert-blocks formerly in use have also heretofore been constructed with straight sloping sides, which were adapted to receive the brick-work of the sewer. In some cases these straight sides were provided with flanges to assist in supporting the brick-work, which flanges were weak and liable to break off.

Now, my invention consists, irst, in combining hollow invert-blocks with projecting noses at the ends that are adapted to lit into the adjoiningblocks and close the joints on three sides, but not at the bottom.

The invention consists, secondly,in constructing the sides of the invert-blocks with inwardly-projecting steps for the better support `of and by the brick-work, as hereinafter shown.

. 5 In` the accompanying drawings, the letter A represents my improved block. The same is provided at one end with a projecting nose,

4o B, which isopen at the bottom, where it projects from the block A and atfthe ends, but closed on the sides and top. The nose B is of such external size and form that it will lit into the end of the next abutting invert-block, as

clearly shown in Fig. 2. By this means, when the invert-blocks are placed one against the other, their joints are closed by the noses B, excepting at the bottom, Where they are left open to receive the subdrainage.

The noses B may either be rigidly attached 5o to the invert-blocks A, as shown in Fig. 2, in which case each invert-block has sucha nose at one end, but not at lthe other end, or they may be made loose, as shown in Fig. 3, in which case such a loose nose, B,l open at the bottom and at its ends, is inserted in the joint of every two abutting invert-blocks. Said joints are closed with cement, except at the bottom. The cement is thoroughly supported by the top and sides of the nose B.

The invertblock, instead of being made with plain sides, is made with inwardly-pro, jecting steps a at its sides, so as to form two inclined surfaces, b and d. This enables me to build up the sewer, so as to place a rowof bricks, e, lengthwise beneath the shoulder or step a. These bricks will support the invertblock, and thereupon the next row f of bricks is laid against the row e and face b, as clearly shown in Fig. l. By this construction the 7o brick-work of the sewer receives a iirm support, and is not liable to slip, and furnishes at the same time a support and brace for the invert-block.

The nose B is applicable to hollow invertblocks of all forms and sizes, and the shoulder a can also be used on all invert-blocks.

1. A hollow invert-block combined withv aV projecting nose; B, which is closed on top and 8o at the sides, but open at the bottom and at the ends, and adapted to be inserted in the next adjoining invert-block, substantially as specitied.

2. The invertblock constructed with in- 8 5 wardly-projecting step a. at each side to produce the inclined surfaces b and d, substantially as herein shown and described.

GUSTAVUS W. BADER.

Witnesses:

WILLY G. E. SCHULTZ, WILLIAM H. C. SMITH. 

